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Rickettsia rickettsii
Scientific classification
Domain: Bacteria
Phylum: Proteobacteria
Class: Alphaproteobacteria
Order: Rickettsiales
Family: Rickettsiaceae
Genus: Rickettsia
da Rocha-Lima, 1916

Rickettsia is a unique genus classified between a virus and a bacteria. The organism is unique in that it has a cell wall and exists only in living cells like a virus, but is susceptible to antibiotics like a bacteria.

The method of growing Rickettsia in chicken embryos was invented by Ernest William Goodpasture and his colleagues at Vanderbilt University in the early 1930s.